Polypteris. COMPOSITE. 337 



P. tripteris, DC. 1. c. Lowest leaves commonly ovate or oblong and entire ; others of 3 

 oval or oblong or the upper linear leaflets : tips of involucral bracts and flowers usually dull 

 white: anther-tips acutish. — Gray, PL Wright, i. 121. — S. Texas; first coll. by Berlandier. 

 (Adj. Mex.) 



150. POLYPTERIS, Nutt. (noil's, many, and Trrepts, meant for irrepov, 

 wing ; many-winged or feathered, i. e. the pappus.) — SoutheasterixJ>JrAmerican~" 

 herbs (entering Mexico), more or less scabrous-pubescent; with undivided and 

 mostly entire petiolate leaves, all or the upper alternate, and loosely corymbose- 

 cymose or paniculate and pedunculate heads of rose-purple or flesh-colored flowers, 

 in summer and autumn. — Gen. ii. t39 ; Ell. Sk. ii. 314 (not of DC, which was 

 a Gaillardia) ; Nutt. Trans. Am. Phil. Soc. ser. 2, 377 ; Gray, Proc. Am. Acad, 

 xix. 30. Part of Palafoxia, Less., DC, &c. 



§ 1. Heads homogamous, middle-sized or small : bracts of the involucre her- 

 baceous up to the small sphacelate colored tip : corollas 5-parted nearly down to 

 the slender tube : akenes narrowly obpyramidal : root annual. (Nearest to Flo- 

 restina.) 



P. callosa, Gray, 1. c. Slender, paniculately branched, a foot or two high : leaves linear, 

 slightly petioled : peduncles glandular : involucre turbinate, 10-12-flowered, quarter-inch 

 high, of 8 or 10 linear-oblong bracts : akenes minutely pubescent or glabrous : pales of the 

 pappus all short, obovate or roundish, with costate-thickened centre seldom reaching the 

 obtuse or erose and retuse apex, occasionally minute or wholly wanting. — Stevia callosa, 

 Nutt. Jour. Acad. Philad. ii. 121 ; Bart. Fl. Am. Sept. t. 46. Florestina callosa, DC. Prodr. 

 v. 655. Palafoxia callosa, Torr. & Gray, Fl. ii. 369. — Low or dry ground, Arkansas to 

 Texas ; first coll. by Nuttall. 



P. Texana, Gray, 1. c. Stouter: leaves from lanceolate-linear to lanceolate-oblong (at 

 least below), distinctly petioled : peduncles less glandular : involucre campanulate or broader, 

 20-30-flowered, 3 to 5 lines high, of 8 to 12 spatulate-oblong bracts : palese of the pappus 

 from oblong-ovate to oblong-lanceolate, with slender nearly complete or slightly excurrent 

 costa, sometimes almost as long as the akene, in the outer flowers often much shorter. — 

 Palafoxia Texana, DG. Prodr. v. 124; Torr. & Gray, Fl. 1. c. — River-banks, Texas; first 

 coll. by Berlandier. (Adj. Mex.) 



§ 2. Heads heterogamous, larger, with palmately 3-lobed rays : disk-corollas 

 parted not quite to the filiform tube : bracts of the involucre herbaceous up to 

 the small and narrow sphacelate colored tip : akenes slender : root annual. 



P. Hookeriana, Gray, 1. «. Stouter, 1 to 4 feet high, above glandular-pubescent and 

 somewhat viscid : leaves from narrowly to broadly lanceolate, mostly 3-nerved below : invo- 

 lucre many-flowered, broad, half -inch or more high, of 12 to 16 lanceolate bracts in two 

 series, the outer looser and often wholly herbaceous, inner with purplish tips : ray-flowers 

 8 to 10, the deeply 3-cleft rose-red rays half-inch long, but sometimes reduced or abortive : 

 pappus in the ray a crown of 6 to 8 short and obtuse rather rigid spatulate pales; in the 

 disk of narrowly lanceolate thin pales, traversed by an excurrent costa, attenuate at apex 

 into a slender point or short awn, nearly of the length of the akene. — Stevia sphacelata 

 (Nutt.), Torr. in Ann. Lye. N. Y. ii. 214. Palafoxia Texana, Hook. Ic. PI. t. 148, not DC. 

 P. Hookeriana, Torr. & Gray, Fl. ii. 368 ; Hook. f. Bot. Mag. t. 5549, with var. subradiata, 

 a reduced state. — Sandy plains of Nebraska to Texas. (Adj. Mex.) 



§ 3. Heads homogamous, rather large : corollas with the base of 5-parted limb 



forming a short-campanulate throat : involucre more imbricated and whitish- 



scarious, glabrous : akenes slender : root perennial. — Polypteris, Nutt. 



P. integrif olia, Nutt. Not glandular : stems 2 to 5 feet high, fastigiately corymbose at 



summit, almost glabrous : leaves scabrous, lanceolate and obtuse, upper ones linear, lowest 



spatulate-oblong to obovate : heads fully half-inch high, many-flowered : principal bracts of 



22 



